Laundry Drum Support Block for Off-Axis Moment Resistance
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Solution Overview
Problem
Laundry appliances with rotating drums experience off-axis moment forces, leading to wobbling and operational fatigue due to unbalanced loads during rotation, which existing technologies fail to adequately address.
Innovation Solution
A structural block with a coupler and lower plate is used to connect the rotating drum to the drive shaft, transferring rotational forces and absorbing off-axis moment forces by engaging the drive shaft at both the top and bottom surfaces, thereby distributing and directing these forces away from the coupler to mitigate wobbling and extend the appliance's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-point coupling is used to connect the drum to the drive shaft, then the device complexity is reduced, but off-axis moment forces cause wobbling and operational fatigue
Solution Approach 1:
The coupling structure is segmented into two distinct engagement points: an upper coupler that transfers rotational forces and a lower plate that absorbs off-axis moment forces. This segmentation allows each component to specialize in handling specific force vectors, resolving the contradiction by maintaining structural simplicity while improving operational reliability through distributed force management.
Solution Approach 2:
The solution transitions from a single-point (0D) coupling to a multi-point (1D/2D) coupling system by adding the lower plate engagement point. This dimensional expansion allows the system to handle not only rotational forces but also off-axis moment forces, thereby reducing wobbling and operational fatigue while maintaining reasonable structural complexity.
2Power
If the coupler engages the top portion of the drive shaft to transfer rotational forces, then power transmission efficiency is improved, but off-axis moment forces concentrate on the coupler causing operational fatigue
Solution Approach 1:
The harmful off-axis moment forces are extracted from the coupler by introducing a separate lower plate component. The lower plate specifically engages the drive shaft to absorb and direct these moment forces away from the coupler, allowing the coupler to focus solely on transferring rotational forces. This extraction extends the service life of the coupler while maintaining power transmission efficiency.
Solution Approach 2:
The lower plate acts as an intermediary component between the drive shaft and the off-axis moment forces. It mediates the interaction by absorbing these forces and directing them away from the coupler, thereby protecting the coupler from operational fatigue while allowing the coupler to efficiently transmit rotational forces.
3Reliability
If the structural block absorbs off-axis moment forces, then wobbling is reduced and operational life is extended, but the device complexity increases due to additional components
Solution Approach 1:
The upper coupler and lower plate are merged into a single integrated structural block assembly. This merging reduces device complexity by eliminating the need for separate coupling mechanisms while maintaining the dual-function capability of transferring rotational forces and absorbing off-axis moment forces. The integrated design achieves operational stability without proportionally increasing complexity.
Solution Approach 2:
The structural block is designed as a multi-functional component that simultaneously performs multiple functions: the upper coupler transfers rotational forces for power transmission, while the lower plate absorbs and directs off-axis moment forces. This universality allows a single structural block assembly to address both power transmission and operational stability requirements without requiring multiple separate components.
Data Source
AI summary
A laundry appliance includes a rotating drum that receives laundry to be treated. A motor rotates a drive shaft about a vertical axis and engages the rotating drum at a base. A coupler is disposed within an upper portion of the base and that rests upon the drive shaft to transfer rotational forces from the drive shaft to the drum. A lower portion of the base engages an outer surface of the shaft to resist moment forces that are exerted against the drive shaft in an off-axis direction relative to the vertical axis.